KeyMint VTS: test getKeyCharacteristics()

Bug: 186685601
Bug: 188855306
Test: VtsAidlKeyMintTargetTest
Merged-In: Icf400533b0ded98b9338f2d782d95d90c7efbff4
Change-Id: Icf400533b0ded98b9338f2d782d95d90c7efbff4
Ignore-AOSP-First: already merged in aosp/master
4 files changed